Depends, if you have to get it made bigger you will need more gold so as well as re-sizing /shaping it you would have to pay for the extra metal of course, could be costly..I would not like to guess but maybe around $100-150??
To get it resized UP may not work for that great a difference in sizes. Only a jeweler can tell you for sure. I've had several rings resized and it, generally, cost $25.00 per size graduation. As it turns out, since I've retired and quit working with my hands so much, my hands have gotten smaller and the resized rings are now too large. Oh, well.